001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.actions;
003
004import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
005import static org.openstreetmap.josm.tools.I18n.tr;
006
007import java.awt.event.ActionEvent;
008import java.awt.event.KeyEvent;
009import java.util.Collection;
010import java.util.List;
011
012import org.openstreetmap.josm.data.osm.DataSet;
013import org.openstreetmap.josm.data.osm.OsmPrimitive;
014import org.openstreetmap.josm.data.osm.visitor.MergeSourceBuildingVisitor;
015import org.openstreetmap.josm.gui.dialogs.LayerListDialog;
016import org.openstreetmap.josm.gui.layer.Layer;
017import org.openstreetmap.josm.gui.layer.OsmDataLayer;
018import org.openstreetmap.josm.gui.util.GuiHelper;
019import org.openstreetmap.josm.tools.ImageProvider;
020import org.openstreetmap.josm.tools.Shortcut;
021
022public class MergeSelectionAction extends AbstractMergeAction {
023    public MergeSelectionAction() {
024        super(tr("Merge selection"), "dialogs/mergedown", tr("Merge the currently selected objects into another layer"),
025            Shortcut.registerShortcut("system:mergeselection", tr("Edit: {0}", tr("Merge selection")),
026            KeyEvent.VK_M, Shortcut.CTRL_SHIFT),
027            true /* register */
028        );
029        putValue("help", ht("/Action/MergeSelection"));
030    }
031
032    public void mergeSelected(DataSet source) {
033        List<Layer> targetLayers = LayerListDialog.getInstance().getModel().getPossibleMergeTargets(getEditLayer());
034        if (targetLayers.isEmpty()) {
035            warnNoTargetLayersForSourceLayer(getEditLayer());
036            return;
037        }
038        Layer targetLayer = askTargetLayer(targetLayers);
039        if (targetLayer == null)
040            return;
041        if (getEditLayer().isUploadDiscouraged() && targetLayer instanceof OsmDataLayer && !((OsmDataLayer)targetLayer).isUploadDiscouraged()
042                && getEditLayer().data.getAllSelected().size() > 1) {
043            if (warnMergingUploadDiscouragedObjects(targetLayer)) {
044                return;
045            }
046        }
047        MergeSourceBuildingVisitor builder = new MergeSourceBuildingVisitor(getEditLayer().data);
048        ((OsmDataLayer)targetLayer).mergeFrom(builder.build());
049    }
050
051    @Override
052    public void actionPerformed(ActionEvent e) {
053        if (getEditLayer() == null || getEditLayer().data.getAllSelected().isEmpty())
054            return;
055        mergeSelected(getEditLayer().data);
056    }
057
058    @Override
059    protected void updateEnabledState() {
060        if (getCurrentDataSet() == null) {
061            setEnabled(false);
062        } else {
063            updateEnabledState(getCurrentDataSet().getAllSelected());
064        }
065    }
066
067    @Override
068    protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
069        setEnabled(selection != null && !selection.isEmpty());
070    }
071
072    /**
073     * returns true if the user wants to cancel, false if they want to continue
074     */
075    public static final boolean warnMergingUploadDiscouragedObjects(Layer targetLayer) {
076        return GuiHelper.warnUser(tr("Merging too many objects with different upload policies"),
077                "<html>" +
078                tr("You are about to merge more than 1 object between layers ''{0}'' and ''{1}''.<br /><br />"+
079                        "<b>This is not the recommended way of merging such data</b>.<br />"+
080                        "You should instead check and merge each object, <b>one by one</b>.<br /><br />"+
081                        "Are you sure you want to continue?", getEditLayer().getName(), targetLayer.getName(), targetLayer.getName())+
082                "</html>",
083                ImageProvider.get("dialogs", "mergedown"), tr("Ignore this hint and merge anyway"));
084    }
085}